Model fits of PSO J318 obtained with our fiducial two-column retrieval setup, considering different types of silicate clouds. Panel a shows the best-fit spectrum of the overall winning model (black solid line) plotted on top of the JWST data (gray circles, with 10^b error scaling). The winning model assumes amorphous spherical SiO particles. The flux contribution of the two individual columns is also shown, at their best-fit relative scaling (salmon and rose colored lines, respectively). The light blue line shows the result of recalculating the best-fit model, but turning off the cloud opacities. Panel b shows the residuals between the best-fit model and the data (with 10^b error scaling). Panel c is a version of Panel a that zooms in on the silicate feature, but the best-fit model is shown in pink instead. Panels d–m show the same zoomed-in view of the silicate feature but for the other tested silicate feature candidates. Panel n shows the residuals between model and data for the various silicate cloud species using the same colors as in panels c–m.